State police arrested a Willimantic man on Friday who they say was involved in the death of a 3-year-old girl.

Police said the unidentified toddler was found unresponsive at 10:38 p.m. Thursday at 11 Potter St. Windham Hospital paramedics transported the girl to Windham Hospital, where she was pronounced dead. No cause of death was been released, and the child was taken to the Chief State Medical Examiner’s Office for an autopsy.

Carroll L. Bumgarner-Ramos, 29, who is listed as living in the same home as the child and who has a lengthy record of assault and drug convictions, was charged with first-degree assault, risk of injury to a minor and committing an offense while out on release. He was not charged with a homicide.

His bail was set at $1.5 million prior to his arraignment next week in Danielson Superior Court.

State police said the investigation into the girl’s death remains open. The incident is being probed by the state police Eastern District Major Crime Unit along with the Willimantic Police Department and the Windham County State’s Attorney’s Office.

Robert Trevorrow, 27, said he’s lived at the Potter Street home for the last year. He said he was woken up late Thursday by the mother of the deceased girl.

“She was screaming, ‘She’s not breathing, help me,’ ” he said. “So I flew downstairs and started CPR until the ambulance came.”

Trevorrow said the girl did not look injured, but he said he saw an animal control unit remove what he described as two mastiff terriers from the home. He said the girl and her mother had been living in a basement apartment in the home for the last couple of months.

According to Windham assessor records, the two-story, seven-bedroom residence is owned by Edwin and Ladonna Lewis, of Falls Church, Va.

Anyone with information about the incident is asked to call Willimantic police at (860) 465-3135.

On Tuesday, less than two miles away from the Potter Street incident, state police conducted a massive manhunt after the shooting and wounding of a Willimantic police officer. Andrew Samuolis was charged in the shooting and in the death of his father, John Samuolis, whose body was found in the home the two men shared.